MFJ-495 Memory Keyer Instruction Manual
© 2001-2009 MFJ Enterprises, Inc. 17
D Decrement – decrements the serial number by one, effectively canceling the automatic
increment applied when last played from a message. The decrement function accommodates
re-sending the last serial number, as might be needed when a repeat of a contest exchange is
requested, or canceling the exchange with a station that proved to be a “dupe”. The unit will
echo a "D" (dah-di-dit) for every number that is decrement. Decrement serial number 0001
rolls over to 9999, because the number 0000 is not used. Alternately, press the [DEC] button
also decrements the serial number.
E## Edit – allows the operator to append onto or edit an existing message memory, where the first
# is the message number 1 to 8 and the second # is the bank A to D. The keyer will display
your message to the last word. You can then paddle in more text or erase existing words, just
like the procedure when loading a message.
F## Farnsworth – uses to enable Farnsworth mode and spacing. Farnsworth spacing adds more
time between characters to slow down the overall sending speed. The advantage of this is
that, by hearing the characters sent at a faster speed, you learn to recognize each character by
its distinctive rhythm, rather than by trying to "count dits." This greatly assists you in
copying Morse code at higher speeds. The Farnsworth speed, however, must be higher than
the overall speed. Setting ## to 00 or less than or equal to the overall speed will disable
Farnsworth mode.
Note: It is recommended the Farnsworth mode be disabled when sending with the paddle.
When Farnsworth mode is enabled, the paddle will send code at the Farnsworth
speed, not the overall speed.
G# Gap (word space) – increases the word space with # standard intra-character spaces, where #
is a single digit from 0 to 9. This allows the normally seven-unit long word space up to 16
units long. Note the word space is always at least four units longer than the inter-character
space.
H Hand key – enters the hand key mode to use the paddle as a hand (straight) key. Dots and
dashes are made manually by using either lever of the paddle. That is, keying follows closure
of the dot or dash paddle, allowing hand-sent code. Normal keyer operation is regained by
squeezing both paddles.
I# Iambic – enables iambic mode A or B where # represents A or B, or disables iambic
operation with # = N.
J#### PTT hang time – sets the PTT (push-to-talk) hang time to #### millisecond, where ####
represents four digits in the range of 0001 to 9999. This controls the time between when CW
keying is ended and when the PTT will de-assert. You may adjust this to your liking for on-
the-air sending.
K## Keying compensation – sets the keying compensation to ## millisecond, where ## represents
two digits in the range of 00 to 25. Some radios have a key delay of 5 ms or more. By
entering K05, the keyer will add 5 ms to the dots and dashes and subtract 5 ms from the intra-
character spaces. Although similar to increasing weight, this adjustment is independent of the
speed. This setting is used primarily to correct keying distortion by certain transceivers and
to eliminate the problems with a transmitter key delay.
L## Lag (keying delay) – sets the keying delay to ## millisecond, where ## represents two digits
in the range of 00 to 20. This setting is used primarily to accommodate switching delay in
certain station setup. It is used in conjunction with the PTT line to delay the keying output
until all the switching is finished; that is, the keying output is lagged behind the sidetone
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